FR2670578A1 - SYSTEM FOR RECORDING MEASUREMENT VALUES IN THE FIELD OF A VEHICLE. - Google Patents

Abstract

a) System for recording measurement values in the field of a vehicle. b) System characterized in that - the stored value can vary in the opposite direction, when - the variable quantity reaches a predefined value or a value zone in the vicinity of the final value, - and then exceeds a predetermined value in the end value zone (minimum end stop) or remains below (maximum end stop).

Description

i "System for recording measurement values in the field

  The invention relates to a system for recording measured values in the field of a vehicle with a transmitter of measured values, which produces a measurement signal of variable size, which is determined at least by a fixed final value, with at least one stored value, which represents at least one of the final values of the variable quantity, with an electronic control and / or control system, which acts on an adjusting element in the vehicle domain at least on the basis of the variable magnitude measuring signal and one of the values stored in memory, at least one of the stored values being modifiable in one direction, when the measuring signal of the variable variable exceeds the value stored in memory (stop of 1 m minimum stroke) or remains below (limit stop maximum) A system of this type is known from the document DE-OS 3,612,904 In this document is present as an example of an accelerator pedal position transmitter in conjunction with an electronic accelerator pedal a measurement value transmitter, which produces a measurement signal of variable magnitude, the position of the accelerator pedal characterized by at least one fixed final value On the basis of this measurement signal and at least one stored value, representing the final values, an adjustment element is actuated, for example a throttle valve or an injection pump , by means of a control system and / or

electronic regulation.

  To compensate for the disturbances, which act by changing them on at least one of the final values of the variable quantity and in this way on the control or regulation of the adjustment element, at least one of the values stored in memory is modified when the measurement signal of the measurement value transmitter exceeds the value stored in memory The value stored in the memory is covered by the value of the measurement signal then existing. At the beginning of the vehicle operating cycle, predefined start values are preset for the stored values During operation, the stored value is then corrected by comparison with the current value of the measurement signal, when the current value of Measured signal exceeds stored value The expected signal value for subsequent reprocessing in the motor control system is obtained from the current value of the measurement signal by interpolation and normalization on the basis of at least

  one of the values stored in memory.

  The relationship between the measurement signal and the position of the adjustment element is therefore given by a characteristic stroke or by a characteristic field. An inaccurate value stored in memory can, consequently, lead to an erroneous association of the true value of the signal. measuring position at the position of the adjustment element and thus has a false reaction of the engine control system, which

  affects the safety and comfort of walking.

  To avoid this, it is provided in DE-OS 3 612 914 to reduce each stored value to its initial value, when the current value of the measurement signal has not reached the end.

  a preset time this storage.

  By returning the value or values stored in the value (s) to exceed the learning process, each time is started again. If, in addition, one of the final values after a certain period of time 'is no longer started, so that a corrective learning can no longer take place, the engine control system performs its function on the basis of the starting configuration, which does not take into account

  current effective relationships.

  In a position transmitter of an electronic accelerator pedal there is the risk that, for example, by reducing the values stored in the starting values, it follows an unsatisfactory operation and a reduced walking comfort due to of engine power jumps to

internal combustion.

  It is therefore an object of the present invention to provide measurements that improve such a system for recording measurement values relating to operational safety.

and the comfort of walking.

  This is achieved by the fact that at least one of the stored values can be changed in one direction, when the measurement signal of the variable variable exceeds the stored value, that the stored value can be changed. in the opposite direction when the variable magnitude reaches a predefined value or a zone of value in the vicinity of the final value or the final value itself and then exceeds a predetermined value in the region of the

final value.

  In other words, the average slope to be determined, on the basis of the final values, of the characteristic curve or the characteristic field is modified in the sense of an increase by the variation of at least one of the values set. memory under predefined conditions, when the variable magnitude reaches a predefined value or a value area in the vicinity of at least one of the final values or one of the final values itself and then exceeds a predetermined value in the

  area of the respective final value.

  In DE-OS 3 428 879 (US Pat. No. 4,730,264), there is provided a device for recording measurement values in vehicles, in which apart from stored values, representing the terminal positions, others Limit values are provided The values stored in the memory are then modified when the current value of measured value values exceeds the value stored in memory In addition, a correction of the values stored in the limit value direction takes place with each sequence when the current value of the measurement values is in the area between the value

  stored in memory and the limit value.

  Even these measures can not fulfill the requirements of the operating safety and ride comfort measurement systems because the stored value is changed with each program run, as long as the current value of the measured values is in the Value area included

  between the stored value and the limit value.

  The invention is characterized in that: the value stored in the memory can vary in the opposite direction, when the variable quantity reaches a predefined value or a value area in the vicinity of the final value, and then exceeds a predetermined value in the area. the final value (minimum final stop) or

  stays behind (maximum end stop).

  The method according to the invention improves the known learning systems with regard to operational safety and operating comfort. An inaccurate value, stored in memory, representing a final value is corrected without restricting the operational safety and reliability. In addition, it is possible at the beginning of each operating cycle to start from the value stored in the previous operating cycle A return to the predefined starting value is missing. The measurements according to the invention also prevent a permanent correction of the value stored in memory and thus improves the walking comfort of

system.

  According to another characteristic of the invention, the variable magnitude is the variable position between two final stops of an operating element which can be actuated by the driver or a control element in the field of a vehicle and the transmitter of values of

  measurements is a position transmitter.

  According to another characteristic of the invention, the electronic control and regulation system is an electronic accelerator pedal system. According to another characteristic of the invention, a position signal S is formed by inerpolation and normalization from a fixed value zone starting from the measurement signal U and the value or values stored in memory, indicating the

  final values and representing the final stops.

  According to another characteristic of the invention, it is checked whether the variable quantity has reached a predefined value or a zone of values in the vicinity of the final value or has exceeded the predetermined value in the zone of the final value (minimum final stop) or has remained below (maximum end stop), by comparison of the measurement signal U or the position signal S with the corresponding threshold values. According to another characteristic of the invention, the threshold values are identical for the predefined value or the value zone and the predetermined value. According to another characteristic of the invention, the threshold values are identical for the predefined value or the zone of values and the

predetermined value.

  According to another characteristic of the invention, the measurement signal U is compared with the value or the values stored in memory and in the case of exceeding or under-overshooting the existing measurement signal is then stored in memory as representing the values final, the measurement signal

U being filtered.

  According to another characteristic of the invention, the system for recording measurement values in the field of a vehicle, with a transmitter of measurement values, which produces a measurement signal of a variable magnitude, which is characterized at least by a lower and / or higher fixed final value, with values stored in memory, which represent these final values of the variable quantity, with an electronic control and / or regulation system, which acts on a control element in the domain of the vehicle at least on the basis of the measurement signal of the variable magnitude and the values stored in memory, the relationship between the measurement signal and the adjustment element being provided in the form of a characteristic curve or a characteristic field, in which an average slope, to be determined on the

  basis of the final values, of the characteristic curve

  can be influenced by varying at least one of the values stored in these predefined conditions, characterized in that the slope can be changed in the direction of an increase, when the variable magnitude reaches a predefined value in a zone of values in the neighborhood of at least one of the final values, and then exceeds a predefined value in the

  area of the corresponding end value.

  According to another characteristic of the invention, the average slope is determined by a straight line, which passes through the values put in

memory as final values.

  The invention will be explained hereinafter at

  using the following description and drawings according to

  FIG. 1 shows a block diagram of the recording system of measurement values in the field of a vehicle, FIG. 2 represents an example embodiment of the method according to the invention using 3 represents the reactions of the measurements, according to the invention, on the characteristic curve (characteristic field) measurement signal / adjustment element. FIG. 1 shows a block diagram of a system for recording measurement values in the field of a vehicle. A measuring device is indicated by the reference 10, which device delivers a signal by the driver 12. In the case of the measuring device 10, it is preferably a position transmitter connected to a mechanical element of the vehicle, in which the mechanical element connected to the position transmitter is movable between two end positions. A position transmitter of this type can be constituted in a manner known as a potentiometer or a double potentiometer or as a

non-contact position sensor.

  As regards the movable element connected to the measuring device 10, it is preferably an accelerator pedal of a vehicle, a throttling valve of an internal combustion engine or of an adjusting rod of an injection pump of a

diesel motor.

  In addition, the procedure according to the invention described below is applicable to all measuring devices, whose measurement signal or whose measured variables have at least one final value, which varies as a result of

  disturbances during the life of the system.

  The conductor 12 connects the measuring device 10 to a control and / or regulation system 11 and is brought here to an input circuit 13 which transforms the measurement signal, for example into

  corresponding numerical values.

  The conductors 17 and 20 lead from a connection node 18 are in connection with the input circuit 13 to a storage unit or a calculation unit 14 via its input 16 (conductor 17) as well as 'to a unit of

1 S filtering 22 (conductor 20).

  This filtering unit 22 is also connected by the connecting conductor 24 to a comparison stage 26, the second input of which is fed by the conductor 28, which connects the memory or calculation unit 14 via its output 30. at the comparison stage 26 A conductor 32 connects the output of the comparison stage 26 to the input 34 of the

memory / calculation 14.

  Finally there is a connecting conductor 36, which connects through the output 38 the memory / calculation unit 14 with a device 40 for controlling / regulating a vehicle not shown or an internal combustion engine not shown This device 40 is connected by the conductor 42, which constitutes the output conductor of the control / regulation system to a control element of the internal combustion engine or the vehicle. As regards the control / regulation system, these are preferably engine control systems familiar to those skilled in the art. The value of the measuring signal U produced by the measuring device, delivered by the conductor 12, which serves to control at least one function in the field of the vehicle or of the internal combustion engine, is interpolated and standardized in a manner known in the memory / calculation unit 14 on the basis of the values stored therein, representing the final values of the measured quantities or the limits of the

  measurement domain (see DE-OS 3 612 904).

  The memory / calculation unit 14 records on the basis of the current value U of the measurement signal, which is fed to the conductor 17 and values stored in the signal value S, which by the output 38 of the signal unit memory / calculation 14 and the driver of

  link 36 is supplied to the controller / controller

  The control device 40 calculates, by reprocessing the signal value S, a control signal for the adjustment element 44 whose position is influenced as a function of the value U

the measurement signal.

  The control or regulating system 11 consequently determines a relationship between the magnitude of the measuring signal U and the position of the adjusting element, which can be represented as a characteristic curve or a characteristic field In the simplest case, this curve is a straight line, as shown in Figure 3. For complicated functions, however, an average slope can be recorded taking into consideration the final values, with the help of which the effects of proceed according to the invention can be clearly explained to the

figure 3.

  In addition, the value U of the measurement signal, which is delivered by the measuring device 10, is directed by the conductor 20 on the filter element 22. The filter element 22 delivers the value U of the measurement signal with a delay time by the conductor 24 to the comparison stage 26 With regard to the filter element 22, it is advantageously a first-order timer, for example a low pass filter with

  a predefined time constant.

  In the comparison stage 26, the value U of the measurement signal sent with delay by the driver 24 is compared with a value placed in the memory-calculation unit 14 and delivered by its output 30 as well as the connection conductor 28 to the comparison stage 26 This value represents the lower final value of variable variables or of the measurement signal. If it is found in comparison stage 26 that the value stored in memory is smaller than the value U of the measurement signal, the value stored in memory is then sent back to the memory-calculation unit 14 by the connection conductor

32 and the entrance 34.

  In the opposite case, when the value U of the measurement signal is smaller than the value stored in the memory, the value U of the measurement signal is transmitted instead of the value stored in the memory unit and the value set in memory is

  covered by this value U of measurement signal.

  To correct a higher end value, the procedure is analogous. In the comparison stage 26, the value U of the filtered measurement signal is compared with the value stored in memory, representing the upper terminal value. When exceeding the set value, memory by the value U of the measurement signal, the value stored in memory is

  covered by this measurement signal value.

  In addition, the value stored in the memory-calculation unit 14 is corrected in the opposite direction, when the value of the measurement signal or the variable quantity reaches a predefined value or a value zone close to the respective final value. or the final value itself and then exceeds a predetermined value in the area of the

respective final value.

  The control of the value zone takes place in an exemplary embodiment from the signal value S It is also advantageous to use the measuring signal of the measuring device or, for example, in the case of a double potentiometer , a measurement signal also recording the variable magnitude. The means described above are described in more detail in the following from the diagram.

according to Figure 2.

  After starting the part of the program corresponding to the beginning of a cycle of operation of the vehicle, an initialization of the part of the program occurs in the step 100, initialization which carries out a zeroing of the marks described below as well as storing the value M recorded in the last operating cycle,

representing the final values.

  In the following step 102, the value U of the measurement signal is stored in step 104, it is compared with the values M stored in memory. If the interrogation relates to a minimum value, then we examine whether the value U of the measurement signal is smaller than the value of the memory Mji, if on the contrary it relates to a maximum value, a query is made to know if the value U of the measurement signal is greater than the value of the

memory mmax.

  For reasons of visibility, the filtering of the measurement signal, which is not necessary, has been omitted here, but is nevertheless advantageous.

  If we observe in the interrogation phase

  104 that the value U of the measurement signal remains below the value stored in memory (minimum selection) or exceeds the value stored in memory (maximum selection), whereas in phase 106 the respective memory value M is covered by the current value U of the measurement signal The new memory value M then accepts the value of the value of the measurement signal If in the interrogation phase 104 it is the opposite decision is taken, we then go directly to the phase 108 , which also represents

  the program phase on phase 106.

  Here, the signal value S exploited by the control / regulation system, which can allow values between zero and a predefined maximum value, is indicated in a known manner in DE-OS 3 612 904 according to a formula and calculated on the basis of the values Mmj and Mmax stored in memory and the value U of the signal of

measured.

  According to the calculation which has taken place of the normalized signal value S and interpreted according to the phase 108, in which S varies for example between 0 and 100, in the phase 110 a check is made for the lower final value and, if appropriate for the final higher value than the value 1 If this is not the case, the signal value S is checked from there in the interrogation phase 112, to know if it is in a zone of values Ai at In the vicinity of the respective final value the respective end value itself has been reached. Thus, the value area has, for example,

  the case of throttle valve control systems

  typically an angular magnitude of the order of a few degrees. If the signal value S is not in the value zone or if it has the respective final value or does not reach its minimum value or its maximum value, the signal value S is delivered in the phase 114 and the part of program

  corresponding to phase 102 is again traveled.

  If it is realized in the phase 112, that the signal value S fulfills the conditions laid down, the corresponding reference point is then set to 1 in the phase 116 and in the interrogation phase 118 the signal value S is compared with a predefined threshold A 2 or a predefined threshold area, which is advantageously in the vicinity of the minimum value or the maximum value of the signal value S, that is to say of the respective end value lS <O + Ai (S> 100Ai) l If neither the comparison shows in phase 118 that the signal value S reaches the threshold value, nor has it exceeded (minimum value of the value signal S) neither remained below (maximum value of the signal value S), we then go to the phase 114 and the value

  signal S calculated in phase 108 is delivered.

  If one realizes during the next course of the program in the phase 110 that one of the marks has taken the value 1, phase 118 is executed in the phase. In the meantime, the signal value S has reached the threshold value, or has exceeded or remained lower then in the phase 120, the value stored in memory M increases by 1 in the case of the minimum value and is lowered by 1 in the case of the maximum value and in the phase 122 the landmark

correspondent is set to zero.

  In this way it is ensured that the stored value is corrected in the opposite direction of the true known self-learning direction, when the signal value S reaches a predefined threshold value or has passed or remained thereabout and after the signal value S has reached a predefined value or a value area in the vicinity of the final value

  respective or the final value itself.

  In another advantageous embodiment, the verification described above takes place at

  from the measurement signal U value.

  The threshold values A1, A 2 checked in the phases 112 and 118 are typically in a zone surrounding the final values or the end stops, which area is approached by the variable magnitude in normal operation without any doubt. values can then in an advantageous development of the device be chosen identical or different from the value

  minimum final and maximum final value.

  FIG. 3 shows the effects on the characteristic curve (characteristic field) of reference. A characteristic curve 200 in the shape of a straight line shows a characteristic slope, of a characteristic curve or of a characteristic field, average characteristic slope formed in taking into consideration the final values The measurement signal magnitude U on the horizontal axis may vary between the minimum value and the maximum value predefined by the final values of the variable quantity, which correspond to the values put in

memory Mmi, and Mmax.

  On the vertical axis the position a of the adjustment element has been raised, which can move in a similar way between a minimum value (min) and a value

maximum (max).

  As an example of a lower final value, the translation of the straight lines appears clearly when using the method according to the invention. An increase in the stored value of 1 (M ') leads accordingly to a greater slope, as shown for example by means of straight lines 202 in dashes, while the

  exceeding the value stored in memory (or the sub-

  overrun) results in a decrease, by the

  value of the measurement signal, of this slope.

Claims (2)

R E V E N D I C A T IO N S   l) System for recording measurement values in the field of a vehicle with a measurement value transmitter, which produces a measurement signal of a variable magnitude, which is determined by at least one fixed final value, with at least one stored value, which represents at least one of the final values of the large variable, with an electronic control and / or control system, which acts on a control element in the vehicle field on the basis of of the measurement signal of the variable magnitude and one of the values stored in memory, at least one of the stored values being able to be modified in one direction, when the measurement signal of the variable magnitude exceeds the set value. memory (minimum limit stop) remains below (maximum end limit stop), system for recording measured values, characterized in that the value stored in memory can vary in the opposite direction, when the a variable magnitude reaches a predefined value or a value area in the vicinity of the final value, and then exceeds a predetermined value in the area of the final value (minimum end stop) or   stays behind (maximum end stop).   System according to Claim 1, characterized in that the variable quantity is the variable position between two end stops of an operating element which can be actuated by the driver or of a control element in the field of a vehicle. and the transmitter of values of   measurements is a position transmitter.   System according to one of the claims   preceding, characterized in that the electronic control and regulation system is a   electronic accelerator pedal system.   System according to one of the claims   characterized in that a position signal S is formed by interpolation and normalization from a fixed value area starting from the measurement signal U and the value or values stored in memory, indicating the values   final and representing the final stops.   c) System according to one of the claims   characterized in that it is checked whether the variable magnitude has reached a predefined value or a zone of values in the vicinity of the final value or has exceeded the predetermined value in the area of the final value (minimum end stop) or is remained behind (maximum end stop), by comparing the measurement signal U or the position signal S with the corresponding threshold values.   System according to one of the claims   in that the threshold values are identical for the predefined value or the   zone of value and the predetermined value.   System according to one of the claims   in that the threshold values are identical for the predefined value or the   zone of values and the predetermined value.   System according to one of the claims   preceding, characterized in that the measurement signal U is compared with the value or values set   memory and in the case of overrun or under   exceeding the existing measurement signal then is stored as representing the final values, the measurement signal U being filtered.   9) System for recording measured values in the field of a vehicle, with a transmitter of measurement values, which produces a measurement signal of a variable magnitude, which is characterized by at least a lower fixed end value and / or higher, with stored values, which represent these final values of the quantity by cable, with an electronic control and / or regulation system, which acts on a control element in the field of the vehicle at least on the basis of the measurement signal of the variable magnitude and the stored values, the relationship between the measurement signal and the setting element being provided as a characteristic curve or a characteristic field, in which a slope average, to be determined on   basis of the final values, of the characteristic curve   can be influenced by varying at least one of the values stored in these predefined conditions, characterized in that the slope can be changed in the direction of an increase, when the variable magnitude reaches a predefined value in a zone of values in the neighborhood of at least one of the final values, and then exceeds a predefined value in the   area of the corresponding end value.   System according to claim 9, characterized in that the average slope is determined by a straight line, which passes through the values   stored as final values.